BS ISO 19940:2017:2018 Edition
$102.76
Tyre stiffness index testing procedure for passenger car extended mobility and run flat tyres
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 20 |
This document specifies the testing method for determining the tyre stiffness index of passenger car tyres for the products capable of supplying the vehicle with the basic tyre functions, at least, at a speed of 80 km/h (50 mph) and a distance of 80 km when operating in flat tyre running mode, as per ISO 16992.
This method is meant to determine the above mentioned index, for the characterization of the expected tyre’s stiffness through its air and structural components.
To reach the target, the vertical force and the vertical deflection, in the sense of absolute position in Z direction under different operating conditions, are measured (approximated in case of zero inflation pressure) and combined through the metrics defined in this document.
This method is not intended to be used for conventional tyres.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Test method 4.1 General |
| 10 | 4.2 Inflated tyre — Vertical stiffness measurement 4.2.1 Tyre inflation pressure 4.2.2 Tyre positioning 4.2.3 Rims 4.2.4 Equipment minimum requirements 4.2.5 Machine set-up |
| 11 | 4.2.6 Maximum testing load 4.2.7 Procedure |
| 12 | 4.3 Zero inflation pressure tyre — Structural stiffness determination 4.3.1 General |
| 13 | 4.3.2 Mathematical model of the vertical forces |
| 14 | 4.3.3 Quality of the approximation 4.3.4 Mathematical model of the total stiffness 4.3.5 Deflection calculation |
| 15 | 4.3.6 Structural stiffness calculation 4.4 Structural part of the TSI |
| 16 | 4.5 Air part of the TSI 4.6 Tyre stiffness index (TSI) calculation |
| 18 | Annex A (informative) Test report example |
| 19 | Bibliography |
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